Carex sect. Ammoglochin

Dumortier

Fl. Belg., 146. 1827.

Treatment appears in FNA Volume 23.

Plants not cespitose, sometimes extensively colonial, long-rhizomatous; rhizomes 1–3 mm thick, with persistent, brown scales, thin, loose cortex, easily detatched when dry. Culms brown or black at base. Leaves: basal sheaths eventually fibrous; sheath fronts membranous, distal leaves with narrow hyaline or whitish-hyaline band extending at least 1/2 sheath length; blades V-shaped in cross-section when young, widest leaves 1+ mm, glabrous. Inflorescences racemose, with 3–25 spikes, ovoid to cylindric; proximal bracts scalelike, usually cuspidate, sheathless; lateral spikes pistillate, staminate, or androgynous, sessile, without prophylls; terminal spike pistillate or androgynous. Proximal pistillate scales with apex obtuse to acuminate or short-awned. Perigynia ascending, veined on both faces, sessile, lanceolate to broadly ovate, planoconvex, base rounded, not spongy, margins acutely angled, at least distally, winglike margins 0.1+ mm wide, apex abruptly contracted to beak, glabrous; beak more than 0.25 mm, with abaxial suture, margins often serrulate, apex bidentate. Stigmas 2. Achenes biconvex, smaller than bodies of perigynia; style deciduous.

Distribution

Temperate regions of the Northern Hemisphere

Discussion

Species 14 (2 in the flora).

Selected References

None.

Key

1 Perigynia thin-margined but without prominent, expanded wing; pistillate scales shorter than to nearly equaling perigynia; terminal spike usually pistillate or androgynous. Carex siccata
1 Perigynia thin-margined and prominently winged at base of beak; pistillate scales usually longer than perigynia; terminal spike usually staminate. Carex arenaria

"thin" is not a number.

... more about "Carex sect. Ammoglochin"
biconvex +
smaller +
A. A. Reznicek +
Dumortier +
shortened +
whitish-hyaline +, hyaline +  and narrow +
rounded +
not spongy +
v--shaped +
0mm;20mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
black +  and brown +
round +  and trigonous +
Temperate regions of the Northern Hemisphere +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
ovoid +  and cylindric +
sessile +, staminate +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
serrulate +  and winglike +
with (1-)3-6(-30) bristles and/or scales +
sessile +  and veined +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
adventitious +
persistent +
basal +  and proximal +
2-keeled +
cylindric +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +
2-3(-4)-fid +
Carex sect. Ammoglochin +
section +
plant +, colonial +  and not cespitose +